Method for determining a corrected current-voltage characteristic curve of an electrical system
a current-voltage characteristic curve and electrical system technology, applied in photovoltaic energy generation, photovoltaics, measurement devices, etc., can solve problems such as deformation of measurement data, affecting the electricity production of the entire string, and therefore of the entire installation, and previous known solutions are often not applicabl
Active Publication Date: 2022-05-17
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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Benefits of technology
The invention provides a solution for an electrical system, such as a photovoltaic system. It is particularly useful when the measurement time is very short, 20 milliseconds. The technical effect of this invention is to improve the accuracy and reliability of the measurement process in the electrical system.
Problems solved by technology
The presence of a fault in a string of photovoltaic modules specifically hinders the electricity production of the entire string, and therefore of the entire installation.
These stray effects lead to deformations in the measurement data.
Moreover, it may be noted that previous known solutions are often not applicable when it is desired to obtain a complete I-V curve that is sufficiently sampled and measured over a very short time (for example for the purpose of diagnostics based on the I-V curve).
Method used
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[0061]The invention aims to obtain a corrected curve I*-V of an electrical system 1, this corrected curve I*-V reflecting the actual operating state of the electrical system. Actual operating state is intended to mean the operating state minus the stray capacitive and inductive effects liable to disrupt the measurements and therefore distort the potential diagnostics to be performed on the system.
[0062]The method of the invention is implemented by virtue of a particular device that in particular has calculation means grouped into a control and processing unit UC and that has current-voltage measurement means 10 across the terminals of the monitored electrical system. FIG. 1 thus shows the various means of the device for obtaining the desired corrected curve I*-V.
[0063]Without limitation, it is considered that the electrical system under consideration is a photovoltaic system. Photovoltaic system is understood to mean a photovoltaic cell, a set of several photovoltaic cells that are ...
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A method for determining a corrected current-voltage curve of an electrical system, the method including the following steps: obtaining a first current-voltage characteristic curve of the electrical system, by varying the voltage across its terminals at a first measurement rate, obtaining a second current-voltage characteristic curve of the electrical system, by varying the voltage across its terminals at a second measurement rate, different from the first rate, using a single notional capacitance to model an intrinsic stray effect to be corrected between an input voltage without the stray effect and the output voltage, determining a correction value representative of the stray effect and a step of determining a corrected current value on the basis of the determined correction value.
Description
TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates to a method for determining a corrected current-voltage characteristic curve of an electrical system.[0002]The electrical system may in particular be a photovoltaic system, such as a photovoltaic cell, a photovoltaic module having a plurality of photovoltaic cells or a string of photovoltaic modules.[0003]The invention also relates to a device for determining the corrected current-voltage curve of an electrical system, said device being able to implement said method.PRIOR ART[0004]It is known that the operation of certain electrical systems may be characterized by a current-voltage curve, also called I-V curve. Such a curve specifically makes it possible to ascertain the current produced by the electrical system as a function of the voltage that is present across its terminals. It is then possible to track the operating state of the system by establishing its I-V curve from measurements, and possibly to diagnose its...
Claims
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IPC IPC(8): H02S50/10H02S40/30
CPCH02S50/10H02S40/30G01R31/2603G01R31/40Y02E10/50
Inventor LESPINATS, SYLVAINAMHAL, MOHAMED
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES